# num1 = range(10)
# for n in num1:
#     print(n, end="\t")
# print()

# num2 = range(2,8)
# for n in num2:
#     print(n, end="\t")
# print()

# num3 = range(1,10,3)
# for n in num3:
#     print(n, end="\t")


num4 = range(1,100)
total = 0
for n in num4:
    if n % 2 ==0:
        total += 1

print(f"1-99之间一共有{total}个偶数")